Commit 2a50e2e8 authored by Guido Trotter's avatar Guido Trotter
Browse files

walkthrough.rst: updates for maxmem/minmem



- Fix two example outputs
- Improve N+1 resolution section specifying how different memories
  affect N+1 calculation depending on the node
Signed-off-by: default avatarGuido Trotter <ultrotter@google.com>
Reviewed-by: default avatarIustin Pop <iustin@google.com>
parent d4fcd298
......@@ -478,7 +478,8 @@ redundancy::
- initrd_path: default ()
Hardware:
- VCPUs: 1
- memory: 128MiB
- maxmem: 256MiB
- minmem: 512MiB
- NICs:
- nic/0: MAC: aa:00:00:78:da:63, IP: None, mode: bridged, link: xen-br0
Disks:
......@@ -857,7 +858,8 @@ with 12GB of RAM (numbers chosen so that we run out of memory)::
node1# gnt-instance modify -B memory=4G instance1
Modified instance instance1
- be/memory -> 4096
- be/maxmem -> 4096
- be/minmem -> 4096
Please don't forget that these parameters take effect only at the next start of the instance.
node1# gnt-instance modify …
......@@ -915,8 +917,15 @@ solve this, you have a number of options:
- try to manually move instances around (but this can become complicated
for any non-trivial cluster)
- try to reduce memory of some instances to accommodate the available
node memory
- try to reduce the minimum memory of some instances on the source node
of the N+1 failure (in the example above ``node1``): this will allow
it to start and be failed over/migrated with less than its maximum
memory
- try to reduce the runtime/maximum memory of some instances on the
destination node of the N+1 failure (in the example above ``node2``)
to create additional available node memory (check the :doc:`admin`
guide for what Ganeti will and won't automatically do in regards to
instance runtime memory modification)
- if Ganeti has been built with the htools package enabled, you can run
the ``hbal`` tool which will try to compute an automated cluster
solution that complies with the N+1 rule
......
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